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from builtins import object 

__all__ = ["PhysicalParameters"] 

 

class PhysicalParameters(object): 

""" 

A class to store physical constants and other immutable parameters 

used by the sims_photUtils code 

""" 

 

def __init__(self): 

#the quantities below are in nanometers 

self._minwavelen = 300.0 

self._maxwavelen = 1150.0 

self._wavelenstep = 0.1 

 

self._lightspeed = 299792458.0 # speed of light, = 2.9979e8 m/s 

self._planck = 6.626068e-27 # planck's constant, = 6.626068e-27 ergs*seconds 

self._nm2m = 1.00e-9 # nanometers to meters conversion = 1e-9 m/nm 

self._ergsetc2jansky = 1.00e23 # erg/cm2/s/Hz to Jansky units (fnu) 

 

@property 

def minwavelen(self): 

""" 

minimum wavelength in nanometers 

""" 

return self._minwavelen 

 

@minwavelen.setter 

def minwavelen(self, value): 

raise RuntimeError('Cannot change the value of minwavelen') 

 

 

@property 

def maxwavelen(self): 

""" 

maximum wavelength in nanometers 

""" 

return self._maxwavelen 

 

@maxwavelen.setter 

def maxwavelen(self, value): 

raise RuntimeError('Cannot change the value of maxwavelen') 

 

 

@property 

def wavelenstep(self): 

""" 

wavelength step in nanometers 

""" 

return self._wavelenstep 

 

@wavelenstep.setter 

def wavelenstep(self, value): 

raise RuntimeError('Cannot change the value of wavelenstep') 

 

 

@property 

def lightspeed(self): 

""" 

speed of light in meters per second 

""" 

return self._lightspeed 

 

@lightspeed.setter 

def lightspeed(self, value): 

raise RuntimeError('Cannot change the value of lightspeed ' + 

'(Einstein does not approve)') 

 

 

@property 

def nm2m(self): 

""" 

conversion factor to go from nm to m 

""" 

return self._nm2m 

 

@nm2m.setter 

def nm2m(self, value): 

raise RuntimeError('Cannot change the value of nm2m') 

 

 

@property 

def ergsetc2jansky(self): 

""" 

conversion factor to go from ergs/sec/cm^2 to Janskys 

""" 

return self._ergsetc2jansky 

 

@ergsetc2jansky.setter 

def ergsetc2jansky(self, value): 

raise RuntimeError('Cannot change the value of ergsetc2Jansky') 

 

 

@property 

def planck(self): 

""" 

Planck's constant in ergs*seconds 

""" 

return self._planck 

 

@planck.setter 

def planck(self, value): 

raise RuntimeError('Cannot change the value of planck')